Bump gatsby-plugin-robots-txt from 1.5.6 to 1.6.8

[dependabot-preview]

Bumps gatsby-plugin-robots-txt from 1.5.6 to 1.6.8.

Release notes

Sourced from gatsby-plugin-robots-txt's releases.

v1.6.8

1.6.8 (2021-06-28)

Bug Fixes

• bump ws from 7.4.0 to 7.5.0 (#474) (99e9086)

v1.6.7

1.6.7 (2021-06-28)

Bug Fixes

• bump browserslist from 4.14.7 to 4.16.6 (#475) (4177992)

v1.6.6

1.6.6 (2021-06-28)

Bug Fixes

• bump y18n from 3.2.1 to 3.2.2 (#476) (dce4f99)

v1.6.5

1.6.5 (2021-06-28)

Bug Fixes

• bump trim-newlines from 3.0.0 to 3.0.1 (#464) (befb12d)

v1.6.4

1.6.4 (2021-06-28)

Bug Fixes

• bump normalize-url from 5.3.0 to 5.3.1 (#465) (1022bd7)

v1.6.3

1.6.3 (2021-06-28)

Bug Fixes

• Default value of sitemap option is not correct (#469) (66ccd4f), closes /github.com/mdreizin/gatsby-plugin-robots-txt/blob/e04abbc660c611d927148840420395a93a6afe91/src/gatsby-node.js#L75

v1.6.2

1.6.2 (2021-05-10)

... (truncated)

Commits

• 99e9086 fix: bump ws from 7.4.0 to 7.5.0 (#474)
• effd90b Update README.md
• 4177992 fix: bump browserslist from 4.14.7 to 4.16.6 (#475)
• dce4f99 fix: bump y18n from 3.2.1 to 3.2.2 (#476)
• b7f494e chore(appveyor): fix cache
• befb12d fix: bump trim-newlines from 3.0.0 to 3.0.1 (#464)
• c703c06 chore(deps-dev): bump semantic-release from 17.4.2 to 17.4.4 (#470)
• 4766589 style: formatting
• ad9d6fa chore: add semantic-release config
• 2e09105 Update dev.yml
• Additional commits viewable in compare view

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